Back to results
US 6,815,511 B2Granted
Continuous withdrawal from high solids slurry polymerization
AssigneeChevron Phillips Chemical Company LP
InventorsDonald W. Verser, David H. Burns, James E. Hein, George K. Rajaendran, John D. Hottovy
Life of this patent
Estimating the term…
Abstract
An improved polymerization process includes withdrawing a portion of a fluid slurry through a plurality of active continuous take off mechanisms, monitoring the pressure of feed material fed to the reactor, and adjusting the continuous take off mechanisms in response to the monitored feed line pressure.
Claims13
A polymerization process comprising:
- feeding a feed material comprising at least one olefin monomer to a loop reaction zone;
- polymerizing, in the loop reaction zone, the olefin monomer to produce a fluid slurry comprising solid olefin polymer particles;
- continuously withdrawing a portion of the fluid slurry through a plurality of active slurry withdrawal lines;
- monitoring the pressure in the active slurry withdrawal lines;
- and
- opening an inactive slurry withdrawal line in response to the monitored pressure in one of the active slurry withdrawal lines.
3 more elements
A process for operating a loop polymerization reactor, the process comprising:
- feeding at least one olefin monomer and diluent to the reactor;
- feeding a polymerization catalyst to the reactor;
- circulating a fluid slurry comprising unreacted ethylene and solid polyethylene particles in the diluent through the reactor;
- continuously withdrawing a portion of the fluid slurry through a plurality of active continuous take off;
- and
- continuously flushing diluent through an inactive continuous take off.
3 more elements
A process for starting a loop polymerization reactor, the process comprising:
- feeding ethylene to the reactor;
- and
- feeding isobutane to the reactor;
- wherein the mass ratio of ethylene to isobutane fed to the reactor is sufficiently low to avoid plugging of a continuous take off.
1 more element
Dependencies are inferred from the claim text.